Definitions:
a length of water wider than a strait, joining two larger areas of water, especially two seas.

a band of frequencies used in radio and television transmission, especially as used by a particular station.

a method or system for communication or distribution

an electric circuit which acts as a path for a signal

a tubular passage or duct for liquid

a groove or furrow

direct towards a particular end or object

(of a person) serve as a medium for (a spirit)